@marty
I think it would be an amazing enhancement.
If I look at my own personal use, I keep flicking from one favourite folder to another all day.
If they pre-load, it means that Webapp would essentially become super fast and instant for the users!
A massive performance improvement…
So you could set the pre-fetched folders to be the same as the favourite folders and job done…

@Fux @SchweidJ can you provide an export of your contacts. it seems there is something in one of your contacts that cannot be handled by libical.
To export you can use kopano-backup. The command to only backup contacts would be kopano-backup -u user1 -f Contacts -l debug. If would help if you could send your contacts (or even better only a subset of failing contacts) to feedback at kopano dot io.

Hi @Gerald,
at this moment this is triggered every 3600 seconds. Eventually we want to increase this to e.g. once a day.
For more info see https://stash.kopano.io/projects/KC/repos/kopanocore/browse/provider/server/ECServer.cpp#1009-1011